聚苯胺复合修饰电极对抗坏血酸的电催化氧化

研究了聚苯胺/聚乙烯磺酸盐(PAn/PVS)复合修饰电极的制备及其在中性缓冲溶液中对抗坏血酸(AH2)的电催化性能.结果表明,该复合修饰电极对抗坏血酸具有良好的电催化作用,其催化氧化峰电位为80 mV,催化氧化的温度系数为2.62%/℃.在浓度为1.0×10-6～5.0×10-3 mol/L范围内,催化电流与抗坏血酸的浓度具有良好的线性关系.     

碳纳米管修饰电极对抗坏血酸的电催化性能研究

采用循环伏安法研究了碳纳米管修饰玻碳电极对抗坏血酸的电催化活性。研究表明,碳纳米管修饰玻碳电极对抗坏血酸具有优异的电催化活性,与裸玻碳电极相比,抗坏血酸在该修饰电极上的氧化峰电位负移0.502 V,氧化峰电流增加78%;抗坏血酸浓度在1.0×10-5～0.1 mol/L范围内呈良好线性关系,最低检测限为1.0×10-6 mol/L。     

NiO-MWCNT修饰热解石墨电极的电化学行为研究

采用滴涂法将适量碳纳米管修饰到热解石墨电极上,后电沉积纳米氧化镍得到MWCNT/NiO/PG复合修饰电极。研究了它的电化学行为,并用于抗坏血酸的测定。试验表明,在pH=6的磷酸盐缓冲溶液中,抗坏血酸在修饰电极上产生一灵敏的氧化峰。当抗坏血酸的浓度在1.0×10-5～5.0×10-4 mol/L时,氧化峰电流与浓度呈线性关系,线性方程为:I(uA)=-0.4458-0.5922C(mmol/L),相关系数为R=-0.9989。检出限低至5.5×10-7 mol/L。该传感器重现性、稳定性、抗干扰性良好。     

基于钯纳米线阵列修饰电极的抗坏血酸电化学研究

以氧化铝模板为基础,采用电化学沉积方法制备了钯纳米线阵列修饰金电极。电化学方法研究了该修饰电极对抗坏血酸电化学行为,实验结果表明,抗坏血酸在高度有序的钯纳米线饰电极表面出现显著的氧化峰。氧化峰的峰电流与抗坏血酸的浓度在4.0×10-4~3.15×10-3 mol/L范围内有良好的线性关系,检测限可达1×10-4 mol/L。该电极制备方便,有良好的灵敏度和稳定性。     

基于聚L-精氨酸修饰玻碳电极的抗坏血酸电化学传感器的研究

研究了电化学方法制备聚L-精氨酸修饰电活化玻碳电极(PLA/GCME)即抗坏血酸电化学传感器及抗坏血酸(AA)在该传感器上的电化学行为。结果表明,传感器对AA具有较好的催化作用。AA的氧化峰电流与其浓度在1.0×10-2~1.0×10-5mol/L范围内呈现良好的线性关系,检出限为6.71×10-6mol/L。传感器具有良好的重现性和稳定性。该方法用于实际样品的测定,回收率在98.3%~104.1%之间。     

基于铁氰化铈纳米膜的对苯二酚传感器

采用电聚合法制备了铁氰化铈纳米膜修饰玻碳电极,用扫描电镜(SEM)对修饰膜进行了表征。利用循环伏安(CV)法研究了对苯二酚(HQ)在该电极上的电化学行为。结果表明,与裸电极相比,HQ在铁氰化铈纳米膜修饰电极上的氧化峰峰电流有明显增高。用示差脉冲伏安(DPV)法在优化条件下检测出HQ在1.0×10-5~6.0×10-4mol/L浓度范围内与氧化峰电流有良好的线性关系,线性相关系数R=0.998。信噪比为3时,HQ的检出限为1.0×10-6mol/L。用该方法对环境水样中的HQ进行了分析,回收率为95.2%~104.8%。     

聚溴酚蓝/壳聚糖修饰玻碳电极对抗坏血酸的电催化氧化作用

在玻碳电极表面滴涂一层壳聚糖膜,吸附富集聚溴酚蓝介体,使其固定在电极表面,制备了聚溴酚蓝/壳聚糖玻碳修饰电极,研究了抗坏血酸在修饰电极上的电化学行为.实验结果表明,修饰电极对抗坏血酸具有良好的电催化氧化性能,在4.0×10-6-1.0×10-3mol/L范围内,抗坏血酸浓度与其循环伏安扫描峰电流呈良好的线性关系,相关系数为0.999 3,检测限1.2×10-6mol/L.该法测定药物中抗坏血酸的含量,结果满意.     

乙二醇的电化学分析方法研究

本文制备了介孔碳/纳米铂复合材料修饰玻碳电极,并采用循环伏安法研究了乙二醇在该电极上的电化学行为,与乙二醇在裸玻碳电极上的电化学行为进行相应的对比,发现乙二醇在修饰电极上的氧化峰电流较大,且氧化峰电势电位较低,表明乙二醇在该修饰的电极上具有良好的电催化氧化效应。乙二醇在浓度范围为1.0×10~(-5)~1.0×10~(-3)mol/L之间与峰电流ip呈良好的线性关系,据此建立了乙二醇的电化学分析方法,可用于实际样品中乙二醇的测定。     

碳纳米管修饰阵列电极同时测定抗坏血酸和尿酸

本文建立了基于计时电流法的碳纳米管修饰阵列电极同时检测抗坏血酸和尿酸的方法。首先制作了由两个碳工作电极(1mm×2mm)、一个大面积碳对极(2mm×13mm)和一个厚膜Ag/AgCl参比电极构成的集成化碳阵列电极系统,然后以多壁碳纳米管修饰碳阵列电极,最后分别在CH1道电极电位为0.211V测定了抗坏血酸,在CH2道电极电位为0.428V测定了尿酸。实验结果表明,通过聚乙烯不干胶掩膜模板和手工丝网印刷碳技术制作的阵列电极电极面积一致,电活性好。CH1道氧化峰电流(I_(pCH1))与抗坏血酸浓度在4.0×10~(-6) mol/L～4.0×10~(-5)mol/L呈良好的线性关系,CH2道氧化峰电流(I_(pCH2))尿酸浓度在4.0×10~(-7) mol/L～4.0×10~(-6) mol/L呈良好的线性关系。本文设计的电极和建立的测定方法在多种生物样品的同时测定方面具有潜在的价值。     

多巴胺在石墨烯/多壁碳纳米管电极上的电化学行为

采用滴涂法在玻碳电极上修饰氧化石墨烯及多壁碳纳米管,通过电化学还原方法制备石墨烯/多壁碳纳米管复合材料及相应修饰电极(ERGO/MWCNTs/GCE)。运用循环伏安法研究多巴胺(DA)在修饰电极上的电化学行为。研究表明:与裸玻碳电极相比,多巴胺在修饰电极上氧化峰与还原峰电位差为70 m V,峰电流显著提高,表明该电极对多巴胺具有较好的催化氧化作用。高浓度抗坏血酸的存在不影响多巴胺的测定。在优化实验条件下,多巴胺在4.8×10~(-7)~1.1×10~(-5)mol/L和1.1×10~(-5)~2.93×10~(-4)mol/L范围内呈良好的线性关系,检出限为8.7×10~(-8)mol/L,RSD为4.3%。     

Structural,Morphological, Optical,and Electrical Properties of PANi-ZnO Nanocomposites

Thin films of polyaniline (PANi) and PANi–Zinc oxide (ZnO) nanocomposites have been synthesized by a spin-coating technique. The ZnO powder of particle size 50–60 nm was synthesized by sol–gel technique and the polyaniline was synthesized by chemical oxidative polymerization of aniline. The nanocomposite films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), UV–Vis spectroscopy, and four probe technique, and the results were compared with polyaniline films.     

Novel method of fabrication of polyaniline–CdS nanocomposites: Structural,morphological and optoelectronic properties

Polyaniline–CdS nanocomposites have been synthesized by spin coating technique. The nanocrystalline CdS powder of particle size 40–50 nm was synthesized by sol–gel technique and the polyaniline was synthesized by chemical oxidative polymerization of aniline. The composite films were characterized by X-ray diffraction (XRD), field effect scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy and Four probe method. The results were compared with corresponding data on pure polyaniline films. The intensity of diffraction peaks for PANi–CdS composites is lower than that for CdS. The conductivity measurement shows that molecular chain constitution of polyaniline is the most important carrier in polyaniline–CdS nano composite. The optical studies showed that variation in band gap of polyaniline (3.40 eV) to 2.54 eV CdS which is attributed to the interaction of CdS nanoparticles with PANi molecular chains.     

Water-Soluble Polyaniline/Polystyrene Sulfonate Synthesized Using Dialysis Membrane

Relatively narrow molecular weight distribution polyaniline/poly(4-styrene sulfonate) were synthesized by aqueous chemical oxidation polymerization using a dialysis membrane as the key to controlling the diffusion speed of the initiator. The optical, electrochemical, and electrical properties of the resulting polyaniline/poly(4-styrene sulfonate) were estimated by ultraviolet–visible–near infrared spectroscopy, cyclic voltammetry, and four-point probe. Compared to a bulk polyaniline/poly(4-styrene sulfonate), the resulting polyaniline/poly(4-styrene sulfonate) showed relatively high crystallinity according to X-ray diffraction, and their polydispersity indices ranged from 1.6 to 2.0 as a function of the reaction time. The electrical conductivities of the resulting polyaniline/poly(4-styrene sulfonates) were also enhanced gradually with increasing reaction time.     

Conductive hybrid film from polyaniline and polyurethane-silica

In order to improve the mechanical performance and water resistance of water-borne conducting polyaniline film, conducting polyaniline/polyurethane-silica hybrid film was prepared in aqueous solution employing silanol-terminated polyurethane and methyltriethoxysilane as sol-gel precursors. The hybrid film showed surface resistivity of 10⁸ Ω even though the conducting polyaniline loading was only 10 wt% (or 1.5 wt% of polyaniline), and the mechanical performance as well as water resistance was significantly improved, making it suitable for antistatic application. Therefore, a practical route to water-borne processing of conducting polyaniline is disclosed.     

聚苯胺微乳液合成及其电致变色性

用 (NH4) 2 S2 O8为氧化剂 ,在功能质子酸 水 正丁醇三元体系中 ,用微乳液法合成了聚苯胺。以聚苯胺的电导率和电致变色性能为标准 ,讨论了引发剂、DBSA、反应温度和反应时间对聚苯胺性能的影响 ,并对影响聚苯胺 /聚乙烯醇复合膜的性能因素作了初步探讨。结果表明 :与用常规乳液法合成的聚苯胺相比 ,用微乳液法合成的聚苯胺与聚乙烯醇所成的膜 ,其电导率提高了 2个数量级 ,电致变色性能也更好。     

有机酸掺杂聚苯胺的制备及其结构分析

研究了用十二烷基苯磺酸（DBSA）、磺基水杨酸（SSA）、对氨基苯磺酸（ABSA）和柠檬酸（CA）4种有机酸作掺杂剂制备掺杂态聚苯胺DBSA-PANI、SSA-PANI、ABSA-PANI、CA-PANI的工艺,并制备了样品。经FT-IR和SEM分析表明：4种酸均具有掺杂态聚苯胺的特征吸收峰,其中DBSA-PANI和SSA-PANI的掺杂峰更明显;而ABSA和CA掺杂后的聚苯胺为微纳米粒子结构。大尺寸的有机酸离子掺杂在聚苯胺的链间,可更有效地减弱分子间的相互作用使聚苯胺溶解性提高,导电性增加。样品导电性能最好的是磺基水杨酸掺杂的聚苯胺,电导率接近1 S/cm。     

Microstructural and Optoelectronic Studies on Polyaniline: TiO2 Nanocomposites

Thin films of polyaniline (PANi) and PANi: titanium oxide (TiO₂) composites have been synthesized by sol–gel spin coating technique. The TiO₂ powder of particle size 50–60 nm was synthesized by the sol–gel technique and the polyaniline was synthesized by the chemical oxidative polymerization of aniline. The composite films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, UV-vis spectroscopy and the four-probe method. The results were compared with corresponding data on pure polyaniline films. The intensity of diffraction peaks for PANi:TiO₂ composites is lower than that for TiO₂. The characteristic FTIR peaks of pure PANi are observed to shift to a higher wavenumber in PANi:TiO₂ composite, which is attributed to the interaction of TiO₂ particles with PANi molecular chains. The resistivity measurement shows that the molecular chain constitution of polyaniline is the most important carrier in the polyaniline: nano-TiO₂ composite.     

磁性聚苯胺纳米纤维吸附性能的探究

以有机酸、粉煤灰磁珠为掺杂剂,过硫酸铵为氧化剂,采用氧化聚合的方法合成了磁性聚苯胺纳米纤维,对合成的磁性聚苯胺进行扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、紫外-可见光分光光度计(UV)、振动磁强计(VSM)、X-射线衍射仪(XRD)等表征,揭示了其形貌、结构、成分和磁性能,并使用磁性聚苯胺作吸附剂...     

Electrolyte for copper deposition based on aqueous polyaniline dispersion

The properties of an electrolyte for acid bright copper deposition have been investigated. The influence of polyaniline dispersion, polysafranine dye (levelling component), poly(alkylene oxide) (wetting agent) or dialkyl disulfides (brightener) and combinations of these additives on the quality of electrodeposited coatings were studied. The presence of polyaniline dispersions increased the levelling ability by 16% and at the same time the concentration of the other additives could be considerably reduced. The electrolyte containing polyaniline dispersion could also be efficiently used under production conditions.     

Nanoflakes to nanorods and nanospheres transition of selenious acid doped polyaniline

Morphology transition of selenious acid doped polyaniline from nanoflakes to nanorods and nanospheres was explored by changing the selenious acid-aniline (dopant-monomer) mole ratio in the aniline polymerization. The transition of polyaniline nanospheres to nanorods occurred when the dopant-monomer mole ratio was between 1 and 0.5. The formation of polyaniline nanorods was dominant when the dopant-monomer mole ratio is 0.5. At mole ratio 0.5, nanorods were obtained with the diameter at around 150 nm. At mole ratio 1, both the nanorods and nanospheres were formed and formation of the nanosphere is favored when the mole ratio is more than 1. When the mole ratio was low (0.125-0.03), polyaniline showed flakes like morphology. The morphology transition was studied by scanning electron microscopy and the molecular structure was confirmed by X-ray diffraction, FTIR and UV-vis spectroscopy. A simple and practical route to synthesize polyaniline nanostructures was demonstrated using selenious acid as effective dopant. The mechanism governing the formation of the polyaniline nanostructures is discussed.